Microstructure Analysis on GMAW Additive Manufacturing Parts Constrained by Electromagnetism

Abstract:

A GMAW additive manufacturing process is performed with H08Mn2Si wire to fabricate a cube forming part. A optical microscope was used to observe the cross section aspect of forming part and the structure mechanism has been analysed. The results demonstrate that the forming part structure presents a characteristic that macrostructure is uniform and microstructure changes circularly. The circularly heating pattern of GMAW surfacing forming results in circular microstructure change and preheating of formed bead to subsequent bead and postheating of subsequent bead to formed bead are primary reason. Electromagnetic stirring effect of longitudinal dc magnetic field to molten pool can break dendritic crystal and refine crystal grain, which is in favor of enhancing forming part performance.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 1152-1155
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.1152
• Online since: February 2014
• Authors: Fan Jun Meng, De Ma Ba, Feng Liang Yin, Jun Du
• Keywords: Electromagnetism, GMAW Additive Manufacturing, Microstructure

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